background(0);
triangle(30, 80, 90, 50, 30, 20);
triangle(100-30, 80, 100-90, 50, 100-30, 20);

rectMode(CENTER);
rect(15, 15, 10, 10);
rect(100-15, 15, 10, 10);
rect(100-15, 100-15, 10, 10);
rect(15, 100-15, 10, 10);
